<template>
  <div>
    <div class="block">
      <!-- A面包屑导航区域 -->
			<el-breadcrumb separator-class="el-icon-arrow-right">
				<el-breadcrumb-item :to="{ path: '/about' }">首页</el-breadcrumb-item>
				<el-breadcrumb-item>商品管理</el-breadcrumb-item>
				<el-breadcrumb-item>用户参数</el-breadcrumb-item>
			</el-breadcrumb>
      <el-card>
          <!-- a 警告区域 -->
          <el-alert show-icon :closable="false" title="注意:只允许为第三级分类设置相关参数" type="warning"></el-alert>
            <!-- b 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
       <!--级联选择框   v-model可以把选中的id值双向绑定到对应的数组中 -->
                     <el-cascader
                        expand-trigger="hover"
                        :options="catelist"
                        v-model="selectedCateKeys"
                        :props="cateProps"
                        @change="handleChange">
                     </el-cascader>                    
                </el-col>
            </el-row>
            <!-- c tab页签区域 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">
 
                <el-tab-pane label="动态参数" name="many">
                  <el-button type="primary" :disabled="isBtnDisabled" size="mini" @click="addDialogVisible=true">添加参数</el-button>
                   <!-- 动态参数表格 -->
                   <el-table :data="manyTableData" border stripe>
                       <!-- 展开行-->
                       <el-table-column type="expand">
                         <template slot-scope="scope"> 
                              <!-- {{scope.row}} -->
                              <!-- 循环渲染tag标签  attr_vals就是New Tag新添加的标签-->
                               <el-tag v-for="(item,index) in scope.row.attr_vals"  
                               :key="item.index" closable @close="handleClosed(index,scope.row)">{{item}}</el-tag>
                               <!-- 展开行里面的文本框和按钮切换功能 (当点击New Tag的时候，这个el-input才会显示出来!!!!!!!!)-->
                               <el-input
                               class="input-new-tag"
                               v-if="scope.row.inputVisible"
                               v-model="scope.row.inputValue"
                               ref="saveTagInput"
                               size="small"
                               @keyup.enter.native="handleInputConfirm(scope.row)"
                               @blur="handleInputConfirm(scope.row)">
                              </el-input>
                              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                         </template>
                       </el-table-column>
                       <el-table-column type="index" label="#"></el-table-column>
                       <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                       <el-table-column label="操作">
                          <template slot-scope="scope">
                              <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>       
                              <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>       
                          </template>
                       </el-table-column>
                   </el-table>
                </el-tab-pane>
 
                <el-tab-pane label="静态属性" name="only">
                  <el-button type="primary" :disabled="isBtnDisabled" size="mini" @click="addDialogVisible=true">添加属性</el-button>
                      <!-- 静态属性表格 -->
                   <el-table :data="onlyTableData" border stripe>
                       <!-- 展开行 -->
                       <el-table-column type="expand">
                           <template slot-scope="scope"> 
                              <!-- {{scope.row}} -->
                              <!-- 循环渲染tag标签  -->
                              <el-tag v-for="(item,index) in scope.row.attr_vals"
                               :key="item.index" closable @close="handleClosed(index,scope.row)">{{item}}</el-tag>
                               <!-- 展开行里面的文本框和按钮切换功能 -->
                               <el-input
                               class="input-new-tag"
                               v-if="scope.row.inputVisible"
                               v-model="scope.row.inputValue"
                               ref="saveTagInput"
                               size="small"
                               @keyup.enter.native="handleInputConfirm(scope.row)"
                               @blur="handleInputConfirm(scope.row)">
                              </el-input>
                              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                           </template>
                       </el-table-column>
                       <el-table-column type="index" label="#"></el-table-column>
                       <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                       <el-table-column label="操作">
                          <template slot-scope="scope">
                              <el-button type="primary" size="mini" icon="el-icon-edit"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>       
                              <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>       
                          </template>
                       </el-table-column>
                   </el-table>
                </el-tab-pane>
             </el-tabs>            
      </el-card>
       <!-- C添加参数的对话框 -->
       <el-dialog
         :title="'添加'+titleText"
         :visible.sync="addDialogVisible"
         width="50%"
         @close="addDialogClosed">
         <!-- <span>这是一段信息</span> -->
         <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label- 
               width="100px" class="demo-ruleForm">
           <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
           </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
           <el-button @click="addDialogVisible = false">取 消</el-button>
           <el-button type="primary" @click="addParams">确 定</el-button>
         </span>
       </el-dialog>  
 
       <!-- D编辑参数的对话框      -->
       <el-dialog
         :title="'编辑'+titleText"
         :visible.sync="editDialogVisible"
         width="50%"
         @close="editDialogClosed">
         <!-- <span>这是一段信息</span> -->
         <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
           <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
           </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
           <el-button @click="editDialogVisible = false">取 消</el-button>
           <el-button type="primary" @click="editParams">确 定</el-button>
         </span>
       </el-dialog> 
    </div>
  </div>
</template>

<script>
import classify from "@/api/index"
export default {
  name:"Params",
  data() {
    return {
      current:0,
      catelist:[],//商品分类列表
      activeName: "second",
       //级联选择框的配置对象
       cateProps:{
           value:"cat_id",//指定选中的值
           label:"cat_name",//指定看到的值
           children:'children'//指定父子节点的嵌套属性
        },
        selectedCateKeys:[],//级联选择框双向绑定到的数组
       activeName:"many",//默认被激活的页签的名称
       manyTableData:[],//动态参数的数据
       onlyTableData:[],//静态属性的数据
 
       addDialogVisible:false,//添加参数的对话框 显示
       addForm:{    //添加参数的表单数据对象
           attr_name:""
       },
       addFormRules:{   //规则
           attr_name:[{required:true,message:"请输入参数名称",trigger:"blur"}]
       },
       // 编辑的相关内容
       editDialogVisible:false,
       editForm:{},
       editFormRules:{
           attr_name:[
            {required:true,message:"请输入参数名称",trigger:"blur"}
           ]
       },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList(){
       const {data:res}=await this.$http.getClassify()
        if(res.meta.status!==200){
            return this.$message.error("获取商品分类失败")
        }
        this.catelist=res.data
        console.log("这里是this.catelist",this.catelist);
    },
    // 级联选择框选中项变化，会触发这个函数
     handleChange(){
         this.getParamsData()
    },
    //tab页签点击事件的处理函数 点击tab时触发(点击‘动态参数’/‘静态属性’)
    handleTabClick(){
        console.log("这里activeName",this.activeName);
         this.getParamsData()
    },
    //获取参数的列表数据  (级联选择框或者tab页签 变化时触发)
   async getParamsData(){
         //   证明选中的不是三级分类
        if(this.selectedCateKeys.length!==3){
            this.selectedCateKeys=[]
            this.manyTableData=[]//当选中的不是三级分类时，下面的表格数据应该清空
            this.onlyTableData=[]
            alert('你选中的不是三级分类！！')
            return   //这里这个return写不写都可以
        }else{//选中的是三级分类
          console.log("这里selectedCateKeys",this.selectedCateKeys);
          const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`, 
          {params:{sel:this.activeName}})
         if(res.meta.status!==200){
             this.$message.error("获取参数列表失败")        
          }
            res.data.forEach(item => {//把res.data里面的attr_vals字符串以，分割分割变成数组
                item.attr_vals=item.attr_vals?item.attr_vals.split(","):[]//利用三元，判断attr_vals是否为空，有内容才显示到展开行按钮中
                item.inputVisible=false//控制文本框的显示
                item.inputValue=""//文本框中输入的内容
           });
             console.log("这里getParamsData的res.data",res.data);
            this.$message.success("获取参数列表成功")
            if(this.activeName==="many"){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        }
    },
    addDialogClosed(){   //对话框关闭 重置数据
        this.$refs.addFormRef.resetFields()
    },
    // 点击添加参数对话框的确定按钮，触发这个方法
    addParams(){
        this.$refs.addFormRef.validate(async valid=>{
           if(!valid) return
         const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
             attr_name:this.addForm.attr_name,
             attr_sel:this.activeName
         })
           if(res.meta.status!==201){
              return this.$message.error("添加参数失败")
           } 
           this.$message.success("添加参数成功")
           this.getParamsData()
           this.addDialogVisible=false
        })
    },
 
    // 点击添加参数的编辑按钮  展示编辑对话框
    async showEditDialog(attr_id){
    //    根据id,查询当前参数的信息 
       const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
       {attr_sel:this.activeName})
        if(res.meta.status!==200){
         return this.$message.error("获取参数信息失败")
       }
        this.$message.success("获取参数信息成功")
        this.editForm=res.data 
       this.editDialogVisible=true   
    },
    // 点击编辑对话框的确定按钮，修改参数信息
   editParams(){
        this.$refs.editFormRef.validate(async valid=>{
         if(!valid) return
       const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`
        ,{attr_name:this.editForm.attr_name,
          attr_sel:this.activeName}
        )
        if(res.meta.status!==200){
         return this.$message.error("编辑参数信息失败")
       }
        this.$message.success("编辑参数信息成功")
        this.getParamsData()
        this.editDialogVisible=false
        })
    },
    editDialogClosed(){
        this.$refs.editFormRef.resetFields()
    },
 
//    点击删除按钮，根据ID删除对应参数项
   async removeParams(attr_id){
        const confirmResult=await this.$confirm('此操作将永久删除该参数项, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        if(confirmResult!=="confirm"){
            this.$message.info("已取消删除参数项")
        }//确认删除后  以下根据ID发送删除请求
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
            this.$message.error("删除参数项失败")
        }
            this.$message.success("删除参数项成功")
             this.getParamsData()
    },
    // 文本框失去焦点或者按下enter都会触发这个事件(展开行)
   async handleInputConfirm(scoperow){
        if(scoperow.inputValue.trim().length===0){
         scoperow.inputValue=''   
         scoperow.inputVisible=false
         return
        }//如果没有return，证明输入内容不为空，则继续做后续处理
        scoperow.attr_vals.push(scoperow.inputValue.trim())
        scoperow.inputValue=''   
        scoperow.inputVisible=false
        this.saveAttrVals(scoperow)
    },
    //点击按钮，展示文本输入框(展开行)
     showInput(scoperow){
         scoperow.inputVisible=true
        //  让文本框自动获取焦点，$nextTick方法作用.
        //  页面上元素被重新渲染后，才会执行回调函数中的代码
          this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();//第一个$refs获取saveTaginput,第二个$refs获取原生DOM input？？？？？？？？？？
        });
     },
     //把对attr_vals的操作，保存到数据库(展开行)
    async saveAttrVals(scoperow){
         // 需求发起请求保存这次操作，否则刷新页面就没了
        const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${scoperow.attr_id}`,
        {attr_name:scoperow.attr_name,
        attr_sel:scoperow.attr_sel,
        attr_vals:scoperow.attr_vals.join(",")})//要把attr-vals转回为字符串，才能发送请求
         if(res.meta.status!==200){
            return this.$message.error("修改参数项失败")
         }
             this.$message.success("修改参数项成功")
     },
    //  删除展开列里面的对应的参数可选项
     handleClosed(index,scoperow){
        scoperow.attr_vals.splice(index,1)//从索引号开始删除一个
        this.saveAttrVals(scoperow)
     }
  },
  computed:{
    //如果按钮需要被禁用，就返回true,否则返回false
    isBtnDisabled(){
        if(this.selectedCateKeys.length!==3){
            return true
        }else{
            return false
        }
    },
    //当前选中的三级分类的id (cateId就是文档里分类列表请求参数的那个:id)
    cateId(){
        if(this.selectedCateKeys.length===3){
            return this.selectedCateKeys[2]
        }
        return null
    },
 
    titleText(){
        if(this.activeName==="many"){
            return "动态参数"
        }
        return "静态属性"
      }
    }
};
</script>

<style>
</style>